<template>
  <div>
    <div class="mask" v-show="isShowSelect"></div>
    <el-popover
      :disabled="disabled"
      ref="popo"
      popper-class="treeselect"
      placement="bottom-start"
      :width="popoverWidth"
      trigger="click"
    >
      <el-tree
        class="common-tree"
        :width="width"
        ref="tree"
        :data="list"
        :props="obj"
        :show-checkbox="multiple"
        :node-key="obj.id"
        :default-expand-all="false"
        :check-strictly="checkStrictly"
        :expand-on-click-node="multiple && expandClickNode"
        :check-on-click-node="checkClickNode"
        :highlight-current="true"
        @check-change="nodeClick"
        @node-click="nodeClick"
      ></el-tree>
      <el-select
        :style="`width:${width}`"
        slot="reference"
        ref="select"
        :size="size"
        :width="width"
        :disabled="disabled"
        v-model="returnDataKeys"
        :multiple="multiple"
        :clearable="clearable"
        :collapse-tags="collapseTags"
        @click.native="selectClick"
        @remove-tag="removeTag"
        @clear="clean"
        @blur="close"
        class="tree-select"
      >
        <el-option
          v-for="item in options"
          :key="item.value"
          :label="item.label"
          :value="item.value"
        ></el-option>
      </el-select>
      <!-- <el-row>
                <el-button v-if="multiple" class="ok" @click="isShowSelect=false" size="mini" type="text">确定</el-button>
            </el-row> -->
    </el-popover>
  </div>
</template>

<script>
export default {
  name: 'tree-select',
  props: {
    //绑定的值
    disabled: {
      type: Boolean,
      default: false,
    },
    value: {
      tyep: Object,
    },
    // 树结构数据
    list: {
      type: Array,
      default() {
        return []
      },
    },
    obj: {
      type: Object,
      required: false,
      default: () => {
        return {
          id: 'deptId', // ID
          label: 'deptName', // 显示名称
          children: 'children', //子级字段名
          path: 'path', //路径
          content: 'content', //描述
          parentId: 'parentId', //父id
        }
      },
    },
    // 配置是否可多选
    multiple: {
      type: Boolean,
      default() {
        return false
      },
    },
    // 配置是否可清空选择
    clearable: {
      type: Boolean,
      default() {
        return false
      },
    },
    // 配置多选时是否将选中值按文字的形式展示
    collapseTags: {
      type: Boolean,
      default() {
        return false
      },
    },
    // 显示复选框情况下，是否严格遵循父子不互相关联
    checkStrictly: {
      type: Boolean,
      default() {
        return false
      },
    },
    //多选是设置点击节点是否可以选中
    checkClickNode: {
      type: Boolean,
      default() {
        return false
      },
    },
    //多选时：点击节点展开还是点三角标
    expandClickNode: {
      type: Boolean,
      default() {
        return false
      },
    },
    // 默认选中的节点key
    // defaultKey: {
    //     type: [Number,String,Array,Object],
    //     default () {
    //         return [];
    //     }
    // },
    size: {
      type: String,
      default() {
        return 'small'
      },
    },
    width: {
      type: String,
      default() {
        return '100%'
      },
    },
    height: {
      type: String,
      default() {
        return '300px'
      },
    },
  },
  //上面是父组件可传入参数
  data() {
    return {
      defaultKeys: [],
      defaultKey: '',
      first: false, //
      popoverWidth: '350px', //下拉框大小
      isShowSelect: false, // 是否显示树状选择器
      options: [], //select option选项
      returnDatas: [], //返回给父组件数组对象
      returnDataKeys: [], //返回父组件数组主键值
    }
  },
  computed: {
    treeData() {
      // 若非树状结构，则转化为树状结构数据
      return JSON.stringify(this.list).indexOf(this.obj.children) !== -1
        ? this.list
        : this.switchTree()
    },
  },
  methods: {
    close() {
      // this.isShowSelect = true
    },
    init() {
      // eslint-disable-next-line no-undef,no-debugger
      if (this.multiple) {
        if (this.defaultKeys != undefined && this.defaultKeys.length > 0) {
          // 多选
          if (
            Object.prototype.toString.call(this.defaultKeys).indexOf('Array') !=
            -1
          ) {
            if (
              Object.prototype.toString
                .call(this.defaultKeys[0])
                .indexOf('Object') != -1
            ) {
              //对象
              this.setDatas(this.defaultKeys)
            } else if (
              Object.prototype.toString
                .call(this.defaultKeys[0])
                .indexOf('Number') != -1 ||
              Object.prototype.toString
                .call(this.defaultKeys[0])
                .indexOf('String') != -1
            ) {
              this.setKeys(this.defaultKeys)
            } else {
              console.log('多选：传入参数类型不匹配')
              return
            }
          } else {
            console.log('多选：传入参数类型不匹配')
            return
          }
        }
      } else {
        // 单选
        if (
          Object.prototype.toString.call(this.defaultKey).indexOf('Number') !=
            -1 ||
          Object.prototype.toString.call(this.defaultKey).indexOf('String') !=
            -1 ||
          Object.prototype.toString.call(this.defaultKey).indexOf('Object') !=
            -1
        ) {
          this.setKey(this.defaultKey)
        } else {
          console.log('单选：传入参数类型不匹配')
          return
        }
      }
    },
    //下拉框select点击[入口]
    selectClick() {
      this.$nextTick(function() {
        //设置下拉框自适应宽度
        this.popoverWidth = this.$refs.select.$el.clientWidth - 26
      })
      //显示下拉框
      return (this.isShowSelect = !this.isShowSelect)
    },
    //单选: 树点击方法
    nodeClick(data, node) {
      if (!this.multiple) {
        //单选
        this.isShowSelect = false
        this.setKey(node.key)
        this.$refs.popo.doClose()
      } else {
        //多选
        var checkedKeys = this.$refs.tree.getCheckedKeys() // 所有被选中的节点的 key 所组成的数组数据
        var t = []
        this.options = checkedKeys.map((item) => {
          //设置option选项
          var node = this.$refs.tree.getNode(item) // 所有被选中的节点对应的node
          t.push(node.data)
          return { label: node.label, value: node.key }
        })
        this.returnDataKeys = this.options.map((item) => {
          return item.value
        })
        this.returnDatas = t
      }
    },
    //单选:清空选中
    clean() {
      this.$refs.tree.setCurrentKey(null) //清除树选中key
      this.returnDatas = null
      this.returnDataKeys = ''
      this.popoverHide()
    },
    //单选:设置、初始化值 key
    setKey(thisKey) {
      this.$refs.tree.setCurrentKey(thisKey)
      var node = this.$refs.tree.getNode(thisKey)
      this.setData(node.data)
    },
    //单选：设置、初始化对象
    setData(data) {
      this.options = []
      this.options.push({
        label: data[this.obj.label],
        value: data[this.obj.id],
      })
      this.returnDatas = data
      this.returnDataKeys = data[this.obj.id]
    },
    //多选:设置、初始化值 keys
    setKeys(thisKeys) {
      this.$refs.tree.setCheckedKeys(thisKeys)
      this.returnDataKeys = thisKeys
      var t = []
      //设置option选项
      thisKeys.map((item) => {
        //所有被选中的节点对应的node
        var node = this.$refs.tree.getNode(item)
        t.push(node.data)
        return { label: node.label, value: node.key }
      })
      this.returnDatas = t
      this.popoverHide()
    },
    //多选:设置、初始化对象
    setDatas(data) {
      this.$refs.tree.setCheckedNodes(data)
      this.returnDatas = data
      var t = []
      data.map((item) => {
        //设置option选项
        t.push(item[this.obj.id])
      })
      this.returnDataKeys = t
      this.popoverHide()
    },
    // 多选,删除任一select选项的回调
    removeTag(val) {
      this.$refs.tree.setChecked(val, false) //设置为未选中
      var node = this.$refs.tree.getNode(val) //获取节点
      if (!this.checkStrictly && node.childNodes.length > 0) {
        this.treeToList(node).map((item) => {
          if (item.childNodes.length <= 0) {
            this.$refs.tree.setChecked(item, false)
          }
        })
      }
      this.nodeClick()
      this.popoverHide()
    },
    //下拉框关闭执行
    popoverHide() {
      this.$emit('getValue', this.returnDataKeys, this.returnDatas)
    },
    // 多选，清空所有勾选
    clearSelectedNodes() {
      var checkedKeys = this.$refs.tree.getCheckedKeys() // 所有被选中的节点的 key 所组成的数组数据
      for (let i = 0; i < checkedKeys.length; i++) {
        this.$refs.tree.setChecked(checkedKeys[i], false)
      }
    },

    //树形转为集合
    treeToList(tree) {
      var queen = []
      var out = []
      queen = queen.concat(tree)
      while (queen.length) {
        var first = queen.shift()
        if (first.childNodes) {
          queen = queen.concat(first.childNodes)
        }
        out.push(first)
      }
      return out
    },
    switchTree() {
      return this.buildTree(this.list, this.defaultValue)
    },
    // 将一维的扁平数组转换为多层级对象
    buildTree(data, id) {
      const fa = (id) => {
        const temp = []
        for (let i = 0; i < data.length; i++) {
          const n = data[i]
          if (n[this.obj.parentId] === id) {
            n[this.obj.children] = fa(n[this.obj.id])
            temp.push(n)
          }
        }
        return temp
      }
      return fa(id)
    },
  },
  watch: {
    // eslint-disable-next-line no-unused-vars
    isShowSelect(val) {
      // 隐藏select自带的下拉框
      this.$refs.select.blur()
    },
    treeData(val) {
      //监听tree数据
      if (val.length > 0) {
        this.init()
      }
    },
    value: {
      handler(val) {
        if (val) {
          if (this.multiple) {
            this.defaultKeys = val
          } else {
            this.defaultKey = val
          }
          this.init()
        }
      },
      // immediate: true,
    },
    returnDataKeys: {
      handler(val) {
        if (this.first || val) {
          this.first = true
          this.$emit('input', val)
        } else {
          this.first = true
        }
      },
    },
  },
}
</script>

<style scoped>
.mask {
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  opacity: 0;
  z-index: 11;
}
.common-tree {
  overflow: auto;
}
.tree-select {
  z-index: 111;
}
.ok {
  float: right;
}
.el-row {
  padding-top: 0px !important;
}
</style>
<style>
.treeselect {
  max-height: 400px;
  overflow: auto;
}
</style>
